The Atrix ATIAHV Hazardous Particulate D4.6 HEPA (High Efficiency Particulate Air) Vacuum ATIAHV is an excellent option for cleaning hazardous particulate applications such as silica dust, lead dust, and mold. This HEPA (99.97% efficient at .3 micron) vacuum has four levels of filtration and large capacity for prolonged use with its 4.6 gallon tank and large microfiber filter bag. The four levels of filtration consist of dual HEPA filters, one polyester filter, and one large microfiber bag filter. The primary HEPA filter catches dust and particles, while the secondary HEPA filter prevents the escape of dust and particles from carbon brushes. The ATIAHV Hazardous Particulate D4.6 HEPA vacuum, is a very powerful vacuum at 1,000-watts and used for deep cleaning. The ATIAHV includes a 25' power cord, weighs about 20 pounds, and is extra quiet for sound sensitive environments. An indicator light on the front of the vacuum informs you when the large microfiber bag is full and needs to be changed.